Zakelly opened a new pull request, #25894:
URL: https://github.com/apache/flink/pull/25894
## What is the purpose of the change
As part of FLIP-488, this PR introduced the built-in interval join operator
for datastream with async state access.
- Also a hotfix of forst map state is included, found by testing of
interval join.
## Brief change log
- A hotfix of forst map state
- Introduce `AsyncIntervalJoinOperator`
- Modifying the test harness
- Introduce corresponding UT/ITs.
## Verifying this change
This change added tests and can be verified as follows:
- `AsyncIntervalJoinOperatorTest`
- `IntervalJoinITCase`
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): yes
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? yes
- If yes, how is the feature documented? not documented (later)
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